Grease gun adapter



Nov. 7, 1939.

C. LAGERGREN GREASE GUN ADAPTER Filed March is, 1938 2 Sheets-Sheet 1 Cari fayrgi'eiz.

ATTORNEYS NOV. 7, 1939. LAGERGREN I 2.178.966

GREASE GUN ADAPTER Filed March 16, 1938 2 Sheets-Sfieet 2 @2226. i4 fiqaii V 1 t E 1 1 I! g I I g" 1 I 4/ p n t 59 I A;

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. v AT'roRNEYs Patented Nov. 7, 1939 UNITED STATES PATENT OFFICE i 1 2,178,966 r GREASE GUN ADAPTER Carl Lagergren, Osterville, Mass. Application March 16, 1938, Serial No. 196,282.

' 2 Claims. (01. 284-17) The invention relates to av grease gun and more especially to an adapter for grease guns, nozzles or the like.

The primary object of the invention is the pro- ,5 vision of an adapter of this character, wherein the lubricant gun or nozzle for lubricant can be firmly and securely coupled with a fitting adapted for the flow of grease or lubricant to parts of machinery particularly motor vehicles so that there will be no waste of grease or lubricant between the adapter and the fitting during the feeding of the grease or lubricant, the adapter being readily coupled with and uncoupled from the fitting either through mechanical ormanual manipulation.

Another object of the invention is the provision of an adapter of this character, wherein the construction thereof is novel in form so that a perfect seal will be had when coupling the adapter .20 to a fitting for supplying grease or lubricant to machinery, there being no possibility of acciden-' tal release or uncoupling of the adapter from the fitting while supplying grease or lubricant thereto.

,25 A further object of the invention is the provision of an adapter of thischaracter, wherein the flow of lubricant or grease therethrough will be shut off on the uncoupling of the adapter from a fitting through which grease or lubricant is sup-- .30 plied to machinery and in this manner eliminating waste of such lubricant or grease.

A still further object of the invention is the provision of an adapter of this character, which is simple in construction, thoroughly reliable and .35 effective in operation, assuring quick coupling and uncoupling with a fitting, readily and easily handled, eliminating waste of lubricant or grease and inexpensive to manufacture.

With these and other objects in view, the in- 40 vention consists in'the features of construction, combination and arrangement of parts as will be hereinafter more fully described, illustrated in the accompanying drawings, which disclose the preferred embodiment of the invention and pointed out in the claims hereunto appended.

In the accompanying drawings:

Figure 1 is a vertical longitudinal sectional view through an adapter of the pistol grip type constructed in accordance with the invention.

Figure 2 is an end elevation thereof.

Figure 3 is an elevation of the partly slit contractible and expansible coupling sleeve of the adapter.

5 Figure 4 is an enlarged sectional view on the the drawings.

line 4-4 of Figure 1 looking in the direction of the arrows.

Figure 5 is an enlarged sectional view on the line 5-5 of Figure 1 looking in the direction of the arrow. 5

Figure 6 is a fragmentary longitudinal sectional view of a slight modification.

Figure '7 is an elevation of the coupling sleeve thereof. 1

Figure 8 is a longitudinal sectional view ,10 through a further modification of adapter.

Similar reference characters indicate corresponding parts throughout the several views in Referring to the drawings in detail, particularly ;15 Figures ,1 to 5 inclusive, A designates generally an adapter. constructed in accordance with the invention and comprising a cylindrical outer casing or. shell l0 having an inwardly curved or rounded contracted open outer end M and an internally threaded open end l2, respectively, the latter being fitted with a plug l3 which is threaded into the same and loosely surrounds for sliding movement a discharge tube i l for lubricant or grease. The tube I4 is of less length than the casing or shell l0 and within the latter is joined-a separable nozzle l5 carrying a removable outwardly tapered discharge tip l6 for engaging with agrease or lubricant nipple ll constituting a fitting for machinery and supplying grease or lubricant thereto.

Within the casing or shell [0 andstationarily held about the nozzle I5 is, an expansible, and

contractible coupling sleeve l8 which is formed with diametrically opposed longitudinal slits E9 extending for a major portion of the length thereof and opening through one end of the same, that is to say, the outer end 20 thereof so that this outer end 20 will constitute inherently .resilient gripping jaws 2| for interlocking with-the fitting 40 ll, the latter being formedwith an annular groove 22 for the entry of the jaws 2| therein on'the contracting of the sleeve [8 in a manner presently described. A

The sleeve l8 at the jaw end-2U is enlarged 5 and is beveled at 23 so that when the casing or shell B0 is displaced or moved in one direction relative to the sleeve 18 the beveled portion ,23 will coact with the contracted end .H of the said shell or casing causing thejaws 2l to approach each other for lock coupling with the fitting ll whence the tapered tip I6 will have entered the center passage 24, in the fitting H and in this manner a seal will be had between the adapter and the said fitting on the coupling of the adapter so that a flexible lubricant or grease hose may have connection with the grip or handle. The nipple 21 is equipped with a check return valve 28 to avoid back fiow of lubricant or grease under pressure when supplied through the grip or handle 25, that is, the pipe 26 therein to the tube I4. The grip or handle 25 is fixed to the tube I4 to be disposed at an angle thereto and is formed with an extension 29 carrying a pivot 30 swingingly connecting a trigger 3| therewith. This trigger 3| is trunnioned by pivot fasteners 32 to diametrically opposite sides of the shell or casing II! and thus by operating the trigger 3| the said shell or casing I0 can be shifted relative to the coupling sleeve I8 for the automatic and secure coupling of the adapter to the fitting I'l.

Within the casing or shell I I about the tube I4 at opposite sides of a shoulder 33 on the said tube are counteracting coiled retractile springs 34 and 35, respectively. The spring 35 acts upon a collar 35 fixed to and interiorly of the shell or casing I0 so that when the trigger is in released or normal position this spring 35 will urge the shell or casing in a direction to have the jaws 23 of the sleeve I8 open or expanded with relation to each other. The spring 34 acting between the plug I2 and the shoulder 33 maintains the sleeve at the end 29 in contact with the end II of the sleeve or shell II]. When the trigger 3| is pressed upon, the spring 35 will become compressed and the said end I I will ride on the beveled portion 23 of the jaws 2| causing the closing of these jaws for the coupling action thereof with the fitting IT.

The nozzle I5 has within the same a suitable check valve 3? which is adapted to close and shut ofi the flow of lubricant or grease through the tip I6 when the same is released from the fitting IT to avoid any possible escape or waste of lubricant or grease when the adapter is uncoupled from the said fitting II in the use of the adapter.

In Figure 6 of the drawings there is shown a modification of the invention, wherein the coupling sleeve 38 at its inner end is formed with a coiled expansion spring 39 and this sleeve is slidable upon the nozzle 45, the coiled spring 39 acting against a shoulder 4| on the tube 42 urging the said sleeve in a direction to have its end 44 brought into contact with the contracted open end 45 of the shell or casing 46. The nozzle has therein a spring pressed check valve 4'! which is unseated when lubricant or grease is under pressure and flows through the tube 42 to be discharged into the fitting 48 when the tip 49 of said nozzle 43 is engaged with the fitting. This valve becomes seated to avoid back fiow of lubricant or grease in the tube 42 when being forced into the fitting 48.

V lever straddling the casing and pivoted to the shell or casing 52 which has the contracted open 5 end 53 coacting with the beveled end 54 of the coupling sleeve 55 which is slidably fitted on the said nozzle and is tensioned by a coiled expansion spring 56. Thus the shell or casing 52 when rotated the threads 5| will feed the same 10 so as to have the coupling sleeve expand or contract for coupling and uncoupling action thereof with the fitting.

The shell or casing 46 as shown in Figure 6 of the drawings is controlled by the trigger 3| as is 15 the shell or casing ID in Figure 1 of the said drawings.

In Figure 8 of the drawings the nozzle 50 is formed with a coupling end 51 for detachable fitting with a hose so that lubricant or grease can 2 be delivered under pressure into the said nozzle as is common in grease guns.

What is claimed is:

1. A device of the character described comprising a hand grip provided with a passage opening through one end and through one side spaced from the opposite end, a lubricant feed tube connected with the side opening in the grip, a cylindrical casing slidable relative to the tube and having a contracted open end, a plug embracing the tube and fixed to the casing at the end next to the grip, a collar fixed within the casing, a shoulder on the tube, retractile springs about the tube at opposite sides of the shoulder and engaging the plug and collar, respectively, a dis- 35 placeable nozzle fitted withthe tube and effecting an automatic lubricant discharge cut-off, a coupling sleeve coacting with the contracted open end of the casing and abutting the collar, and a grip and plug, respectively, the lever and the grip being in close relation to each other.

2. A device of the character described comprising a hand grip provided with a passage opening through one end and through one side spaced from the opposite end, a lubricant feed tube connected with the side opening in the grip, a cylindrical casing slidable relative to the tube and having a contracted open end, a plug embracing the tube and fixed to the casing at the end next to the grip, a collar fixed within the casing, a shoulder on the tube, retractile springs about the tube at opposite sides of the shoulder and engaging the plug and collar, respectively, a displaceable nozzle fitted with the tube and efiecting an automatic lubricant discharge cut-01f, a coupling sleeve coacting with the contracted open end of the casing and abutting the collar, a lever straddling the casing and pivoted to the grip .and plug, respectively, the lever and grip being in close relation to each other, and an outwardly tapered tip separably connected with the nozzle.

CARL LAGERGREN. g 

